U.S. patent application number 14/794924 was filed with the patent office on 2016-02-04 for display apparatus and power supplying method thereof.
This patent application is currently assigned to SAMSUNG ELECTRONICS CO., LTD.. The applicant listed for this patent is SAMSUNG ELECTRONICS CO., LTD.. Invention is credited to Jeong-il KANG, Sang-Hoon LEE.
Application Number | 20160036271 14/794924 |
Document ID | / |
Family ID | 55181031 |
Filed Date | 2016-02-04 |
United States Patent
Application |
20160036271 |
Kind Code |
A1 |
LEE; Sang-Hoon ; et
al. |
February 4, 2016 |
DISPLAY APPARATUS AND POWER SUPPLYING METHOD THEREOF
Abstract
Disclosed are a display apparatus and a power supplying method
thereof. The display apparatus includes: a backlight driver
configured to drive a backlight to emit light; a main power supply
configured to detect connection of the backlight to the backlight
driver and supply a voltage to the backlight driver in response to
a control voltage; and a standby power supply configured to supply
the control voltage to the main power supply, in response to
determining the connection of the backlight to the backlight
driver.
Inventors: |
LEE; Sang-Hoon; (Suwon-si,
KR) ; KANG; Jeong-il; (Yongin-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SAMSUNG ELECTRONICS CO., LTD. |
Suwon-si |
|
KR |
|
|
Assignee: |
SAMSUNG ELECTRONICS CO.,
LTD.
Suwon-si
KR
|
Family ID: |
55181031 |
Appl. No.: |
14/794924 |
Filed: |
July 9, 2015 |
Current U.S.
Class: |
345/211 ; 315/86;
345/102 |
Current CPC
Class: |
H02J 9/065 20130101;
G09G 3/3406 20130101; G09G 2330/04 20130101; Y04S 20/20 20130101;
Y02B 70/30 20130101 |
International
Class: |
H02J 9/06 20060101
H02J009/06; G09G 5/00 20060101 G09G005/00; G09G 3/36 20060101
G09G003/36; G09G 3/34 20060101 G09G003/34 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 1, 2014 |
KR |
10-2014-0099159 |
Claims
1. A display apparatus for displaying an image, the display
apparatus comprising: a backlight driver configured to drive a
backlight to emit light; a main power supply configured to supply a
voltage to the backlight driver in response to a control voltage;
and a standby power supply configured to detect connection of the
backlight to the backlight driver and supply the control voltage to
the main power supply, in response to detecting the connection of
the backlight to the backlight driver.
2. The display apparatus according to claim 1, wherein the standby
power supply is further configured to determine whether a video
circuit is connected to the display apparatus, and supply the
control voltage in accordance with a result of the
determination.
3. The display apparatus according to claim 1, wherein the standby
power supply is further configured to determine whether a video
circuit is connected to the display apparatus and supply a power-on
signal to the video circuit in accordance with a result of the
determination.
4. The display apparatus according to claim 1, further comprising a
wire harness comprising a first side and a second side configured
to connect the backlight to the backlight driver.
5. The display apparatus according to claim 4, wherein the first
side of the wire harness comprises a first terminal connected to an
output terminal of the standby power supply and a second terminal
connected to a bias control-voltage input terminal of the main
power supply, the second side of the wire harness comprises a third
terminal configured to be coupled to the first terminal and a
fourth terminal configured to be coupled to the second terminal,
and the third terminal and the fourth terminal are directly
electrically connected to each other.
6. A power supplying method of a display apparatus with a standby
power supply and a main power supply, the power supplying method
comprising: by the standby power supply, generating standby power
based on an input alternating current power; connecting a backlight
driver to a backlight; and by the standby power supply, detecting
connection of the backlight to the backlight driver and based on
the detecting, supplying the generated standby power as a control
voltage to the main power supply.
7. The power supplying method according to claim 6, further
comprising determining whether a video circuit is connected to the
display apparatus, and supplying the control voltage in accordance
with a result of the determining.
8. The power supplying method according to claim 6, further
comprising determining whether a video circuit is connected to the
display apparatus and supplying the control voltage in accordance
with a result of the determination.
9. A display apparatus comprising: a backlight driver comprising a
backlight connection harness, the backlight driver configured to
drive a backlight connected via the backlight connection harness; a
standby power supply configured to generate and output a standby
voltage to the backlight connection harness.
10. The display apparatus of claim 9, wherein the standby power
supply is further configured to receive the standby voltage from
the wiring harness.
11. The display apparatus of claim 10, further comprising a main
power supply, wherein the standby power supply is further
configured to activate the main power supply in response to
receiving the standby voltage from the backlight connection
harness.
12. The display apparatus of claim 11, further comprising a video
circuit configured to generate an activation signal, wherein the
standby power supply is further configured to activate the main
power supply in response to receiving the activation signal
received from the video circuit.
13. The display apparatus of claim 12, wherein the video circuit
comprises a remote-controller light receiver configured to generate
an indicator signal in response to receiving a power command from a
remote control, the video circuit is further configured to generate
the activation signal in response to the indicator signal.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority from Korean Patent
Application No. 10-2014-0099159, filed on Aug. 1, 2014 in the
Korean Intellectual Property Office, the entire disclosure of which
is incorporated herein by reference.
BACKGROUND
[0002] 1. Field
[0003] Apparatuses and methods consistent with exemplary
embodiments relate to a display apparatus and a power supplying
method thereof, and more particularly to a display apparatus and a
power supplying method thereof, which can prevent damage to a
circuit component even though an alternating current (AC) power
plug is connected without a backlight or a video circuit during
assembly or a test process.
[0004] 2. Description of Related Art
[0005] A display apparatus, such as a television (TV), operates by
receiving power from an internal or external power supply. The
display apparatus includes a plurality of components, such as a
video circuit, a backlight driver, a backlight, an audio
reproducer, and the like, to which electric power may be
supplied.
[0006] FIG. 6 is a circuit diagram illustrating a power supplying
structure of a general display apparatus.
[0007] The display apparatus includes a main power supply 10 which
converts an input voltage into voltages needed for respective
components and supplies the converted voltages to the respective
components. The display apparatus also includes a standby power
supply 30 which generates standby power while the display apparatus
is in a standby mode and controls the main power supply 10 to turn
on in response to a power-on signal. As shown in FIG. 6, if the
power-on signal is input via a photo coupler 35 of the standby
power supply 30, a transistor switch Q1 is switched on and off, so
that the standby power supply 30 can supply a control voltage to a
switching integrated circuit (IC) 14 in order to control the main
power supply 10.
[0008] In general, assembly or testing may be performed by
supplying an AC voltage to the display apparatus while the video
circuit is absent. If the video circuit is absent, a power-on
signal may not be transmitted from the video circuit. During
assembly or testing, the main power supply 10 must operate even
though the video circuit is absent. Therefore, as shown in FIG. 6,
the output terminal of the standby power supply 30 is connected to
the power-on signal input terminal of the video circuit, so that
the main power supply 10 can operate whenever an AC voltage is
supplied.
[0009] However, as the power is supplied to the respective
components of the display apparatus when the AC power is supplied
without a connection between the backlight and the video circuit,
the circuit may be damaged.
[0010] In particular, abnormal discharge of electric charges stored
in a capacitor, or similar energy storage element, may damage the
circuit components.
SUMMARY
[0011] An aspect of an exemplary embodiment provides a display
apparatus and a power supplying method thereof, that can
selectively supply a control voltage to a main power supply based
on a connection status between a backlight and a backlight driving
circuit, and to prevent damage to a circuit component from
occurring when power is supplied while a backlight is
disconnected.
[0012] According to an exemplary embodiment, a display apparatus
for displaying an image, the display apparatus includes: a
backlight driver configured to drive a backlight to emit light; a
main power supply configured to supply a voltage to the backlight
driver in response to a control voltage; and a standby power supply
configured to detect connection of the backlight to the backlight
driver and supply the control voltage to the main power supply, in
response to detecting the connection of the backlight to the
backlight driver.
[0013] The standby power supply may be further configured to
determine whether a video circuit is connected to the display
apparatus, and supply the control voltage in accordance with a
result of the determination.
[0014] The standby power supply may be further configured to
determine whether a video circuit is connected to the display
apparatus and supply a power-on signal to the video circuit in
accordance with a result of the determination.
[0015] The display apparatus may further include a wire harness
including a first side and a second side configured to connect the
backlight to the backlight driver.
[0016] The first side of the wire harness may include a first
terminal connected to an output terminal of the standby power
supply and a second terminal connected to a bias control-voltage
input terminal of the main power supply, the second side of the
wire harness may include a third terminal configured to be coupled
to the first terminal and a fourth terminal configured to be
coupled to the second terminal, and the third terminal and the
fourth terminal may be directly electrically connected to each
other.
[0017] According to another aspect of an exemplary embodiment, a
power supplying method of a display apparatus with a standby power
supply and a main power supply, the power supplying method
includes: by the standby power supply, generating standby power
based on an input alternating current power; connecting a backlight
driver to a backlight; and by the standby power supply, detecting
connection of the backlight to the backlight driver and based on
the detecting, supplying the generated standby power as a control
voltage to the main power supply.
[0018] The power supplying method may further include determining
whether a video circuit is connected to the display apparatus, and
supplying the control voltage in accordance with a result of the
determining.
[0019] The power supplying method may further include determining
whether a video circuit is connected to the display apparatus and
supplying the control voltage in accordance with a result of the
determination.
[0020] According to an aspect of another exemplary embodiment, a
display apparatus includes: a backlight driver comprising a
backlight connection harness, the backlight driver configured to
drive a backlight connected via the backlight connection harness; a
standby power supply configured to generate and output a standby
voltage to the backlight connection harness.
[0021] The standby power supply may be further configured to
receive the standby voltage from the wiring harness.
[0022] The display apparatus may further include a main power
supply. The standby power supply may be further configured to
activate the main power supply in response to receiving the standby
voltage from the backlight connection harness.
[0023] The display apparatus may further include a video circuit
configured to generate an activation signal. The standby power
supply may be further configured to activate the main power supply
in response to receiving the activation signal received from the
video circuit.
[0024] The video circuit may include a remote-controller light
receiver configured to generate an indicator signal in response to
receiving a power command from a remote control, and the video
circuit may be further configured to generate the activation signal
in response to the indicator signal.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The above and/or other aspects will become apparent and more
readily appreciated from the following description of exemplary
embodiments, taken in conjunction with the accompanying drawings,
in which:
[0026] FIG. 1 is a block diagram schematically illustrating a
display apparatus according to an exemplary embodiment;
[0027] FIG. 2 is a block diagram illustrating power connections to
respective components according to an exemplary embodiment;
[0028] FIG. 3 is a circuit diagram illustrating power connections
according to an exemplary embodiment;
[0029] FIG. 4 is a diagram illustrating a wire harness according to
an exemplary embodiment;
[0030] FIG. 5 is a flowchart illustrating a power supplying method
according to an exemplary embodiment; and
[0031] FIG. 6 is a circuit diagram illustrating a conventional
display apparatus.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0032] Below, exemplary embodiments will be described in detail
with reference to the accompanying drawings. The following
exemplary embodiments describe configurations related to the
present disclosure, and the descriptions of other configurations
may be omitted. Further, like numerals refer to like elements
throughout. Expressions such as "at least one of," when preceding a
list of elements, modify the entire list of elements and do not
modify the individual elements of the list. In describing exemplary
embodiments, the term "connected to" or "coupled to" that is used
to designate a connection or coupling of one element to another
element includes both a case that an element is "directly connected
or coupled to" another element and a case that an element is
connected or coupled to another element via still another element.
In this case, the term "directly connected to" or "directly coupled
to" means that an element is connected or coupled to another
element without intervention of any other element.
[0033] According to an exemplary embodiment, as shown in
[0034] FIG. 1, a display apparatus 100 may include an image
receiver 200, a power circuit 300, a video circuit 400, a backlight
driver 500, a backlight 600, and a remote-controller light receiver
700. In addition to the foregoing elements, the display apparatus
100 may further include a graphic processor, a storage, a user
interface generator, an audio processor, a wired/wireless
communicator, etc., descriptions of which will be omitted for
convenience.
[0035] The image receiver 200 may include a tuner connected to an
external antenna. The image receiver 200 receives a television (TV)
broadcast through the antenna under control of a microcomputer,
performs a predetermined signal-amplification process or the like,
extracts an image signal from the TV broadcast signal, and outputs
the image signal to the video circuit 400. Additionally, the image
receiver 200 may receive the TV broadcast from a cable or satellite
signal.
[0036] The power circuit 300 may include a main power supply 310
which normally supplies a control voltage to the display apparatus
100 after receiving a power-on signal from the video circuit 400,
and a standby power supply 330 which supplies power to the display
apparatus 100 while in a standby mode.
[0037] For example, the main power supply 310 may supply voltages
for the backlight driver 500 and the video circuit 400.
[0038] The standby power supply 330 may supply standby power as the
control voltage for controlling the main power supply 310 when the
backlight 600 is connected to the backlight driver. That is, if the
backlight 600 is connected to the backlight driver, the standby
power output from the standby power supply 330 is used as a bias
voltage, so that the standby power can be supplied as the control
voltage to the main power supply 310.
[0039] The video circuit 400 may include a microcomputer for
generally controlling the elements of the display apparatus 100.
The microcomputer detects a power-on signal received through the
remote-controller light receiver 700, and uses the power-on signal
as a bias voltage for controlling the standby power supply 330, so
that the standby power supply 330 can supply the standby power as
the control voltage to the main power supply 310.
[0040] The video circuit 400 may include one or more video
processors to process display image data. The image data may be
received from an external source or stored image data. For example,
the video processing may include scaling for enlarging or reducing
the size of image in accordance with given resolutions, decoding
and encoding corresponding to various image formats,
de-interlacing, frame refresh rate conversion, noise reduction for
improving image quality, detail enhancement, line scanning, or any
other processing. The processes may be performed individually or
simultaneously.
[0041] The backlight 600 emits light to the back of a liquid
crystal display (LCD) panel, and may include a light emitting diode
(LED), a cold cathode fluorescent lamp (CCFL), or the like. The
backlight 600 may directly emit light from the back of the LCD
panel or may emit light to an edge, so that the light can be guided
through a light guide plate toward the back of the LCD panel.
[0042] The backlight driver 500 applies driving power to the
backlight 600. The backlight driver 500 may drive the backlight 600
based on a dimming signal and a lighting signal received from a
timing controller. Further, the backlight driver 500 may control
the backlight 600 to emit white light.
[0043] The remote-controller light receiver 700 may receive a
command issued by a user through a remote controller.
Alternatively, for example, a power-on signal may be received from
the display apparatus 100. A user's command received through the
remote-controller light receiver 700 may be identified and
processed by the microcomputer of the video circuit 400. That is,
the microcomputer of the video circuit 400 receives the power-on
signal from the remote-controller light receiver 700, provides the
power-on signal as the bias control voltage to the standby power
supply 330 so that the standby power supply 330 can supply the
standby power to the main power supply 310 and thus the main power
supply 310 can supply voltages to the respective components of the
display apparatus 100.
[0044] FIG. 2 is a block diagram of illustrating power connections
to respective components of the display apparatus 100. The
respective components include, for example, the backlight 600 and
the video circuit 400. The main power supply 310 may supply the
control voltage to another component not shown in FIG. 2.
[0045] As shown in FIG. 2, the main power supply 310 of the power
circuit 300 may supply the control voltage to the backlight 600 via
the backlight driver 500, and also supply the control voltage to
the video circuit 400. The backlight driver 500 may connect to the
backlight 600 through the wire harness 800.
[0046] The standby power supply 330 of the power circuit 300, in
accordance with a bias control voltage, may supply the control
voltage to the main power supply 310 to control the main power
supply 310. The bias control voltage may be provided as the
power-on signal from the microcomputer of the video circuit 400,
and may be provided as the standby power of the output terminal of
the standby power supply 330 when the backlight 600 is connected to
the backlight driver 500. At this time, when the backlight 600 is
connected to the backlight driver 500, the wire harness 800 may be
used for supplying the standby power of the output terminal of the
standby power supply 330 as the bias control voltage.
[0047] Below, the power supplying structure of the display
apparatus 100 according to an exemplary embodiment will be
described in detail with reference to FIGS. 3 and 4.
[0048] As shown in FIG. 3, the main power supply 310 may include a
smoothing condenser 311, a transformer 312, a feedback circuit 313,
and a switching circuit 314. The transformer 312 includes secondary
coils Tr21 and Tr22 to which diodes D1 and D2 are respectively
connected in series and capacitors C1 and C2 are respectively
connected in parallel, thereby constituting the output terminal for
the control voltage.
[0049] Further, the main power supply 310 may additionally include
a rectifier circuit anterior to the smoothing condenser 311. The
rectifier circuit may be, for example, a bridge rectifier circuit
configured to rectify an external AC voltage into a direct current
(DC) voltage.
[0050] The smoothing condenser 311 smoothes the DC voltage output
from the rectifier circuit, and the DC voltage is input to the
primary coil Tr1 of the transformer 312.
[0051] The transformer 312 transforms the DC voltage input to the
primary coil Tr1 into predetermined voltages at secondary coils
Tr21 and Tr22. The voltages are transformed by certain integer
ratios, thereby outputting the transformed voltages to the
backlight driver 600 and the video circuit 400, respectively.
[0052] The feedback circuit 313 may include a photo coupler so as
to feed the voltage at the secondary side of the transformer 312
back to the primary side.
[0053] The switching circuit 314 may apply pulse width modulation
(PWM) to control the voltage at the primary side Tr1 of the
transformer 312 in accordance with the feedback signal of the
feedback circuit 313. The switching circuit 314 may be achieved by
a pulse width control integrated circuit (IC) and a field effect
transistor (FET) switch.
[0054] The standby power supply 330 may include a smoothing
condenser 331, a transformer 332, a feedback circuit 333, a
switching circuit 334, an enabling circuit 335, and a transistor
switch Q1. A secondary coil Tr4 of the transformer 332 connects
with a diode D3 in series and connects with a capacitor C3 in
parallel, thereby constituting an output terminal for a standby
voltage.
[0055] Further, the standby power supply 330 may additionally
include a rectifier circuit anterior to the smoothing condenser
331. The rectifier circuit may be, for example, a bridge rectifier
circuit configured to rectify an external AC voltage into a DC
voltage.
[0056] The smoothing condenser 331 smoothes the DC voltage output
from the rectifier circuit, and the DC voltage is input to the
primary coil Tr3 of the transformer 332.
[0057] The transformer 332 transforms the DC voltage input to the
primary coil Tr3 into predetermined voltages at the secondary coil
Tr4 by respective certain integer ratios, thereby outputting the
standby voltage from the secondary coil Tr4.
[0058] The feedback circuit 333 may include a photo coupler so as
to feed the voltage at the secondary side of the transformer 332
back to the primary side.
[0059] The switching circuit 334 may apply PWM control to the
voltage at the primary side Tr3 of the transformer 332 in
accordance with the feedback signal of the feedback circuit 333.
The switching circuit 334 may be achieved by, for example, a pulse
width control IC and an FET switch.
[0060] The enabling circuit 335 may include a photo coupler to turn
on or off the standby power of the standby power supply 330 applied
to the switching circuit 314 of the main power supply 310.
[0061] The transistor switch Q1 is arranged in between the output
terminal of the standby power supply 330 and the switching circuit
314 of the main power supply 310, so as to control switching of the
switching circuit 314 with the standby power. The transistor switch
Q1 may be achieved by various semiconductor switches such as an FET
switch, etc.
[0062] The standby power output from the standby power supply 330
is connected to a collector C of the transistor switch Q1. An
emitter E of the transistor switch Q1 is connected to the switching
circuit 314 of the main power supply 310. The base B of the
transistor switch Q1 is connected to the output terminal of the
enabling circuit 335.
[0063] As shown in FIG. 4, a first wire harness 810 of the
backlight driver 500 includes terminals 811-816 and a second wire
harness 820 of the backlight 600 includes terminals 821-826. The
output terminal of the transformer 332 at the secondary side is
connected to a fifth terminal 815 of the first wire harness 810
connecting with the second wire harness 820. A sixth terminal 816
of the first wire harness 810 is connected to the bias
control-voltage input terminal of the enabling circuit 335. The
fifth terminal 815 and sixth terminal 816 of the first wire harness
810 may use terminals other than the terminals 811 and 812 used in
connecting the backlight driver 500 and the backlight 600. The
fifth terminal 825 and sixth terminal 826 of the second wire
harness 820 corresponding to the fifth terminal 815 and sixth
terminal 816 of the first wire harness 810 are connected and
short-circuited by a short-circuit wire 827.
[0064] When the first wire harness 810 of the backlight driver 500
is coupled to the second wire harness 820, not only is the control
voltage of the backlight driver 500 supplied to the backlight 600,
but the standby voltage of the standby power supply 330 is also
supplied to the bias control-voltage input terminal of the enabling
circuit 335 via the fifth terminal 815 of the first wire harness
810, the fifth terminal 825 of the second wire harness 820, the
sixth terminal 826 of the second wire harness 820 and the sixth
terminal 816 of the first wire harness 810.
[0065] Thus, the standby voltage of the standby power supply 330 is
supplied to the bias control-voltage input terminal of the enabling
circuit 335 in accordance with a connection between the backlight
driver 500 and the backlight 600. Thereby, the transistor switch Q1
can be turned on to thereby operate the switching circuit 314 of
the main power supply 310 with the standby power.
[0066] Further, the video circuit 400 is connected to the bias
input terminal of the enabling circuit 335, and thus the power-on
signal is supplied from the microcomputer so that the transistor
switch Q1 can be turned on to thereby operate the switching circuit
314 of the main power supply 310 with the standby power.
[0067] As described above, if the video circuit 400 and the
backlight 600 are not mounted in the assembling process or the test
process, the transistor switch Q1 is always turned off because the
default standby power or the power-on signal is not applied to the
enabling circuit 335, thereby preventing the circuit component from
damage.
[0068] If only the video circuit 400 is mounted without the
backlight 600, the main power supply 310 may be operated by the
power-on signal of the video circuit 400.
[0069] Below, the power supplying method of the display apparatus
100 according to an exemplary embodiment will be described with
reference to FIG. 5.
[0070] At operation S110, if AC power is connected, the standby
power is output by the smoothing condenser 331, the transformer
332, the feedback circuit 333 and the switch circuit 334.
[0071] At operation S120, it is determined whether the backlight
driver 500 is connected to the backlight 600.
[0072] If it is determined at operation S120 that the first wire
harness 810 of the backlight driver 500 is connected to the second
wire harness 820 of the backlight 600, at operation S130, the
output standby power is supplied to the bias control-voltage input
terminal of the enabling circuit 335 via the wire harness 800 of
connecting the backlight driver 500 and the backlight 600 and the
transistor switch Q1 is turned on, and at operation S140 the main
power supply 310 is turned on.
[0073] If it is determined at operation S120 that the first wire
harness 810 of the backlight driver 500 is not connected to the
second wire harness 820 of the backlight 600, at operation S150 it
is determined whether the power-on signal from the video circuit
400 is applied to the bias control-voltage input terminal of the
enabling circuit 335.
[0074] If it is determined at operation S150 that the power-on
signal is received from the video circuit 400, the transistor
switch Q1 is turned on, and at operation S140 the main power supply
310 is enabled. If it is determined at operation S150 that the
power-on signal is not received from the video circuit 400, the
transistor switch Q1 is turned off, and at operation S160 the main
power supply 310 is disabled.
[0075] According to an exemplary embodiment, the display apparatus
disables the main power supply, and thus prevents the circuit
component, such as the capacitor, from damage even though the AC
power is connected while the video circuit and the backlight are
not connected.
[0076] Although a few exemplary embodiments have been shown and
described, it will be appreciated by those skilled in the art that
changes may be made in these exemplary embodiments without
departing from the principles and spirit of the exemplary
embodiments. Therefore, the foregoing has to be considered as
illustrative only. The scope of the present disclosure is defined
in the appended claims and their equivalents. Accordingly, all
suitable modification and equivalents may fall within the scope of
the present disclosure.
* * * * *